Coaxial puncture needle suitable for ultrasonic real-time guidance

Abstract

The coaxial puncture needle comprises a needle core, a needle sheath and a limiter, the needle core is arranged in the needle sheath in a penetrating mode, the limiter is arranged on the needle sheath in a sleeved mode, the depth of the needle sheath puncturing into the skin is limited through the limiter, an adhesive tape is attached to the periphery of the limiter, and the adhesive tape is attached to the periphery of the limiter. The limiter is attached to the skin through the adhesive tape to prevent the needle sheath from being taken away from the skin, the head end of the needle core is sharp, the tail end of the needle core is provided with a needle core buckle, the tail end of the needle sheath is provided with a needle sheath buckle, the needle core is buckled on the needle sheath buckle through the needle core buckle and is connected with the needle sheath, the needle sheath buckle is provided with a lever, and the lever is connected with the needle sheath through the lever. The needle core buckle is bounced by pressing the lever, so that the needle core is bounced out of the needle sheath. Compared with the prior art, the efficiency and the safety of ultrasonic real-time guided needle biopsy are improved.

Description

Technical Field

[0001] This utility model belongs to the field of puncture biopsy technology and relates to a coaxial puncture needle suitable for real-time ultrasound guidance. Background Technology

[0002] Ultrasound-guided core needle biopsy plays a crucial role in clinical practice. With in-depth disease research, advancements in various medical technologies, and the invention and optimization of various instruments, the types of diseases for which precise pathological diagnoses can be obtained through core needle biopsy are increasing. Most epithelial-derived malignant tumors can be diagnosed relatively accurately with 1-2 biopsy tissue strips. However, most mesenchymal tumors and some rare diseases, such as lymphoma and soft tissue sarcoma, require more tissue strips for various immunohistochemical staining or gene testing, necessitating more punctures. Using a coaxial needle to guide core needle biopsy can significantly reduce iatrogenic injury to patients, decrease the incidence of puncture complications, and reduce pain during the procedure, demonstrating significant clinical value. Currently, the commonly used coaxial needles used under ultrasound guidance present certain inconveniences.

[0003] First, ultrasound-guided puncture requires extensive experience in visualizing the puncture needle. Beginners often lack the maturity to accurately visualize the needle tract and determine if the needle is fully within the ultrasound plane. This can lead to misjudgment or misfiring of the needle tract, potentially triggering the puncture gun and causing needle-related damage to surrounding organs or blood vessels. Currently, many coaxial puncture needles lack ultrasound-guided design features.

[0004] Secondly, ultrasound-guided core needle biopsy requires the operator to hold the ultrasound probe with one hand and perform the puncture with the other. After positioning the coaxial puncture needle, multiple punctures are performed using a puncture gun through the coaxial puncture needle. Currently, the limiters equipped on commonly used coaxial puncture needles only serve to prevent the needle from being pushed deeper into the skin during insertion and firing. However, they have no limit effect when the needle is withdrawn, causing the coaxial puncture needle to dislodge from the target or even out of the body, requiring repositioning of the coaxial puncture needle.

[0005] Patent CN115300067A discloses a coaxial needle for puncture to prevent radioactive metal artifacts, including a puncture needle and a needle sheath. The puncture needle includes a needle shaft made of engineering plastic to prevent radioactive metal artifacts, and a metal needle core embedded in the shaft for puncture and imaging. The front end of the puncture needle is a conical needle tip, and the needle tip of the metal needle core extends out of the needle shaft. The rear end of the puncture needle has a gripping part with a diameter larger than the needle shaft. An annular groove for fixing the needle sheath is provided at the shoulder between the gripping part and the needle shaft. The needle sheath is a tubular structure made of engineering plastic. A metal strip for indicating the position is embedded in the front side wall of the needle sheath. The needle sheath is fitted with the needle shaft of the puncture needle through a tube hole. The rear end of the needle sheath is positioned in the annular groove of the gripping part of the puncture needle. The needle tip of the front end of the puncture needle extends out of the front end of the needle sheath. The front end of the needle sheath is conical and smoothly transitions to the conical needle tip of the puncture needle. However, this patent only uses a strip of metal on the front side wall of the needle sheath to position the end of the needle sheath. This method can provide a good indication of the end of the needle sheath during CT and MRI scans, but during real-time ultrasound scans, the surgeon needs to perform more scans to display the metal strip. Furthermore, the plastic part of the needle sheath body is not clearly visible under ultrasound. Therefore, this patent is not suitable for real-time ultrasound guidance.

[0006] Patent CN202146342U discloses a thoracentesis needle with the following structural features: the needle sheath and its branch tubes are made of soft material, and the branch tubes are used for aspirating fluid or air or injecting drugs; the hollow needle core is made of metal material, and its needle seat end limiter and elastic air bladder are used to fix the needle core and for anesthesia; the tail end of the needle sheath includes a rubber valve and a length adjuster, the length between the two latches of the adjuster is equal to the length of the exposed part of the needle core; a rotatable soft sheet at the junction of the needle sheath and the branch tube is used to hold the needle and fix the needle sheath; during puncture, the needle sheath and the needle core are combined into a sheath, the elastic air bladder is squeezed to draw in anesthetic for local anesthesia, and then the needle is inserted. After the needle tip enters the subcutaneous tissue, the length adjuster is adjusted to retract the needle core into the needle sheath, and the rotatable sheet is held to continue inserting the needle. After entering the thoracic cavity, the needle core is pulled out and the sheet is rotated to fix it tightly against the skin. Although the patent includes a limiter, its position cannot be flexibly adjusted, resulting in a weak actual limiting effect. The patent's proposed method of simultaneous anesthesia and thoracentesis is unsuitable for actual clinical practice. This is because anesthetic needles typically use 23-25G needles that are inserted slowly, with aspiration failure followed by injection of a small amount of anesthetic, then deeper insertion followed by further aspiration failure, and finally injection of a small amount of anesthetic, gradually infiltrating the pleura layer by layer. The patent's attempt to simultaneously administer anesthesia using a thicker thoracentesis needle poses significant medical safety risks and is inconvenient to perform. Furthermore, the patent's method of using a blunt-tipped, soft needle sheath to rotate and break open the parietal pleura for aspiration of pleural effusion may cause iatrogenic pleural trauma. Soft, straight tubes are generally used for injection and are not suitable for negative pressure aspiration.

[0007] Patent CN218606782U discloses a combined puncture needle for percutaneous hepatic biliary drainage, comprising a hollow needle, a needle sheath, and a needle sleeve. The hollow needle has a handheld, transparent cannula at its tail end; the handheld, transparent cannula has a cap at its rear end; the needle sheath is cylindrical with a coiled portion, and the sheath is inserted into the needle sleeve from one end, with the coiled portion of the sheath being straightened as it enters the inner wall of the needle sleeve; the hollow needle is inserted into the needle sheath and exits through one end of the coiled portion, with the mounting end of the needle sheath engaging with the connecting end of the handheld, transparent cannula of the hollow needle; the combination of the hollow needle and the needle sheath forms the puncture needle; the needle sleeve is used to straighten the needle sheath and prevent the puncture needle from piercing the skin before puncture. However, this patent does not include a design for the needle core ejection method suitable for single-handed operation. Although the patent uses a coating at the end of the needle sheath to enhance ultrasound imaging, it does not optimize the ultrasound imaging of the needle body, and the patent lacks a limiter, making it unsuitable for real-time ultrasound-guided puncture. Utility Model Content

[0008] The purpose of this invention is to overcome at least one of the defects in the prior art and provide a coaxial puncture needle suitable for real-time ultrasound guidance. This invention increases the efficiency and safety of real-time ultrasound-guided puncture biopsy.

[0009] The objective of this utility model can be achieved through the following technical solutions:

[0010] One of the technical solutions of this utility model is to provide a coaxial puncture needle suitable for real-time ultrasound guidance. The coaxial puncture needle includes a needle core, a needle sheath, and a limiter. The needle core is inserted into the needle sheath, and the limiter is sleeved on the needle sheath. The limiter restricts the depth of the needle sheath puncture into the skin. An adhesive tape is applied to the outer periphery of the limiter to attach it to the skin, thereby fixing the limiter to the skin and preventing the needle sheath from being pulled away from the skin. The tip of the needle core is pointed, and a needle core buckle is provided at the end. A needle sheath buckle is provided at the end of the needle sheath. The needle core is fastened to the needle sheath buckle through the needle core buckle and connected to the needle sheath, thereby firmly fixing the needle core and the needle sheath. A lever is provided on the needle sheath buckle. By pressing the lever, the needle core buckle is popped up, causing the needle core to pop out of the needle sheath.

[0011] As a preferred technical solution, the head end of the needle core is selected from either a chiba needle tip or a triangular needle tip.

[0012] Furthermore, the needle core buckle is provided with a buckle hook facing the head end of the needle core, and the hook of the buckle hook faces the body of the needle core. The needle sheath buckle is provided with a buckle protrusion ring facing away from the end of the needle sheath, and the protrusion of the buckle protrusion ring faces away from the body of the needle sheath. When the needle core buckle is fastened to the needle sheath buckle, the buckle hook and the buckle protrusion ring are in contact, so as to firmly fix the needle core buckle and the needle sheath buckle.

[0013] Furthermore, the needle sheath buckle is provided with a fulcrum, and a pivot is provided on the fulcrum. The lever rotates around the pivot. The end of the lever facing the head end of the needle sheath presses down, and the end facing away from the end of the needle sheath lifts up, thus lifting the buckle hook. The needle core will automatically withdraw a short distance, making it convenient to withdraw the needle core from the needle sheath.

[0014] Furthermore, the needle sheath buckle is provided with a protrusion facing the head end of the needle sheath. When the end of the lever facing the head end of the needle sheath is pressed down and the buckle hook is lifted, the protrusion pops up when the lever is no longer pressed, pushing the end of the lever facing the head end of the needle sheath to lift up and the end facing the tail end of the needle sheath to press back down, restoring the lever to its initial position.

[0015] The protrusion is a hollow, bulging component, which facilitates deformation of the protrusion when the lever is pressed, allowing the lever to be pressed down towards the head end of the needle sheath.

[0016] Furthermore, the needle sheath is inlaid with an ultrasound-enhanced imaging ring, which is evenly spaced to facilitate the calculation of the approximate depth of the puncture needle tip.

[0017] Furthermore, the ultrasound-enhanced imaging ring includes a needle body imaging ring and a needle tip imaging ring. The needle body imaging ring is disposed on the main body of the needle sheath, and the needle tip imaging ring is disposed on the tip end of the needle sheath. The width of the needle body imaging ring is smaller than that of the needle tip imaging ring, so that most of the needle sheath appears as a low-echo band under ultrasound, the position of the needle body imaging ring on the main body of the needle sheath appears as a narrow-width strong-echo band, and the position of the needle tip imaging ring at the tip end of the needle sheath appears as a wide-width strong-echo band, which facilitates the differentiation of positions and the determination of the position of the tip end of the needle sheath.

[0018] Furthermore, the spacing between the ultrasound-enhanced imaging rings is 1-1.5 cm, the width of the needle body imaging ring is 0.5-1 mm, and the width of the needle tip imaging ring is 2-2.5 mm.

[0019] Furthermore, the limiter is ring-shaped and has a seam. The two sides of the seam are closed by interlocking the edges to form a tenon and mortise structure. After the handle is released, the material of the limiter tends to return to its initial shape, so that the closed limiter is clamped and fixed on the needle sheath.

[0020] Furthermore, the end of the insert is provided with a handle facing outward. When the seam is closed, the handles are staggered. When the handles are pinched, they are squeezed. When the handles are closed, the limiter is opened, the internal space of the limiter is expanded, and the limiter can move on the needle sheath to adjust the position of the limiter. After releasing the hand, the limiter returns to its initial shape and restores its fixing function.

[0021] Furthermore, the needle core is made of metal, and the needle core buckle, needle sheath, and needle sheath buckle are all made of hard plastic, which makes them less prone to breakage during use. The limiter is made of either plastic or rubber.

[0022] As a preferred technical solution, the needle core is made of a metal selected from stainless steel, cobalt alloy, and titanium alloy; the needle core buckle, needle sheath, and needle sheath buckle are all made of a hard plastic selected from polyethylene, polypropylene, and polycarbonate; and the limiter is made of a plastic or rubber selected from polyethylene, polypropylene, polycarbonate, butyl rubber, fluororubber, and silicone rubber.

[0023] One of the technical solutions of this utility model is to provide a puncture method suitable for real-time ultrasound guidance. This method uses the aforementioned coaxial puncture needle for real-time ultrasound-guided puncture biopsy, and includes the following steps:

[0024] First, move the limiter to the end of the needle sheath to ensure that the needle core is fixed to the needle sheath by the buckle. Under real-time ultrasound guidance, perform puncture. After the needle tip reaches the expected puncture position, adjust the position of the limiter so that the limiter contacts the skin, and attach the adhesive tape on the limiter to the skin for fixation. Press the lever on the needle sheath buckle to pop up the needle core buckle. After the needle core pops out, pull it out of the needle sheath. Then, you can use the puncture needle to perform biopsy sampling via the coaxial puncture needle.

[0025] As a preferred technical solution, the protruding auxiliary pressing lever returns to its original position after the needle core is ejected.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] (1) Ease of use: Due to real-time ultrasound-guided puncture, the operator often needs to operate the puncture needle with one hand. The previous methods of fixing the needle core and needle sheath of the coaxial puncture needle were rotation tightening and snap-locking. If the rotation type is tightened, it is difficult to loosen with one hand. If it is not tightened, the needle core will loosen due to the resistance of the forward movement during the puncture. The existing snap-locking type cannot achieve single-handed operation to remove the needle core. The snap-locking type of this utility model ensures the firm fixation of the needle core and needle sheath during the puncture. By pressing the lever at the end of the needle sheath, it is also convenient for the operator to remove the needle core with minimal hand movements. This can greatly increase the efficiency and safety of real-time ultrasound-guided coarse needle biopsy.

[0028] (2) More comprehensive limiter: The limiter of the previous coaxial puncture needle can prevent the coaxial puncture needle from being pulled into a deeper place during the puncture process, which would lead to unsatisfactory puncture specimen. However, it cannot prevent the coaxial puncture needle from falling out. If the coaxial puncture needle is not fixed by hand, the needle sheath may accidentally fall out when the puncture needle is pulled out. The limiter of this utility model adds an adhesive tape, which can fix the limiter to the skin. It is convenient for the operator to operate with one hand and avoid the accidental fall out of the needle sheath. By improving the limiter by the limiter itself and the adhesive tape, the limiter has an adjustable limiter function in both the inward and outward directions, which can greatly increase the efficiency and safety of ultrasound real-time guided coarse needle biopsy.

[0029] (3) Improved ultrasound visualization: Previous coaxial puncture needles used metal sheaths. Some products had length indicators and claimed that the presence of a sound scattering surface could produce better ultrasound visualization. However, since metal materials already appear as strong echoes under ultrasound, the scattering surface theoretically also forms a strong echo. In actual use, it cannot provide additional acoustic imaging. The sheath lacks a target point to indicate the position of the needle tip. At the same time, since the metal needle sheath is cylindrical, it itself scatters sound waves. Therefore, when there is a small angular deviation between the puncture needle and the ultrasound plane, the ultrasound can still visualize the metal needle sheath. The operator needs a lot of interventional experience to accurately judge whether the needle sheath plane and the ultrasound plane are completely aligned. This determines whether the puncture needle tip is at the preset endpoint after the puncture gun is activated, which greatly determines the thickness of the needle. Safety and effectiveness of puncture: This invention innovatively changes the material of the needle sheath, using hard plastic as the main body and embedding metal rings as ultrasound-enhanced imaging rings, which facilitates imaging under ultrasound. The rings are evenly distributed, allowing the operator to control the length of the needle sheath inserted into the body through ultrasound imaging. Under ultrasound, the needle sheath appears as a hypoechoic area, while the position of the ultrasound-enhanced imaging ring appears as a strong echoic band. A wider strong echoic band indicates the tip of the needle sheath, increasing the special imaging of the needle body and tip segments under ultrasound. This facilitates the operator's accurate judgment of the position of the needle sheath tip. When the strong echoic band at the tip of the needle sheath and the last strong echoic band near the patient's subcutaneous tissue can be simultaneously displayed in a single plane under ultrasound, it indicates that the needle sheath and the ultrasound plane are completely aligned. Theoretically, this can reduce the training cost of the procedure and increase the convenience and safety of core needle biopsy. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the needle core structure in Embodiment 1 of this utility model;

[0031] Figure 2 This is a schematic diagram of the needle sheath in Embodiment 1 of this utility model;

[0032] Figure 3 This is a schematic diagram of the structure of the limiter after the handle is released in Embodiment 1 of this utility model;

[0033] Figure 4 This is a schematic diagram of the limiter closing the handle in Embodiment 1 of this utility model;

[0034] Figure 5 This is a schematic diagram showing the connection between the limiter and the adhesive tape in Embodiment 1 of this utility model;

[0035] Figure 6 This is a schematic diagram of the structure of the rear end of the needle core and needle sheath assembly in Embodiment 1 of this utility model;

[0036] Figure 7 This is a schematic diagram of the structure at the end of the needle core when it is withdrawn in Embodiment 1 of this utility model;

[0037] Figure 8 This is a schematic diagram of the needle sheath in Embodiment 2 of this utility model;

[0038] Figure 9 This is a schematic diagram of the structure of the rear end of the needle core and needle sheath assembly in Embodiment 2 of this utility model.

[0039] Explanation of markings in the diagram:

[0040] 1—Needle core, 2—Needle core buckle, 21—Buckling hook, 3—Needle sheath, 4—Needle sheath buckle, 41—Buckling protrusion ring, 42—Fulcrum, 43—Lever, 44—Protrusion, 5—Ultrasonic enhancement imaging ring, 51—Needle body imaging ring, 52—Needle tip imaging ring, 6—Limiter, 61—Insertion edge, 62—Handle, 7—Adhesive tape. Detailed Implementation

[0041] The present invention will now be described in detail with reference to specific embodiments. These embodiments are based on the technical solution of the present invention and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0042] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first," "second," "third," etc., used to describe a common object only indicate different instances of the same object, and are not intended to imply that the objects described in this way must be in a given order, whether temporally, spatially, sequentially, or in any other way.

[0043] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0044] Example 1:

[0045] A coaxial puncture needle suitable for real-time ultrasound guidance, such as Figure 1 , Figure 2 and Figure 5 As shown, it includes a needle core 1, a needle sheath 3, and a limiter 6.

[0046] The needle core 1 is inserted into the needle sheath 3, and the limiter 6 is fitted onto the needle sheath 3. The limiter 6 restricts the depth to which the needle sheath 3 penetrates the skin.

[0047] An adhesive tape 7 is applied to the outer periphery of the limiter 6. The limiter 6 is attached to the skin by the adhesive tape 7, which serves to fix the limiter 6 to the skin and prevent the needle sheath 3 from being pulled away from the skin.

[0048] The needle core 1 has a pointed tip and a needle core buckle 2 at the end. The needle sheath 3 has a needle sheath buckle 4 at the end. The needle core 1 is fastened to the needle sheath 3 by the needle core buckle 2 and the needle sheath 4, thus firmly fixing the needle core 1 and the needle sheath 3.

[0049] The head end of the needle core 1 is selected from either a chiba needle tip or a triangular needle tip, and in this embodiment, a chiba needle tip is preferred.

[0050] A lever 43 is provided on the needle sheath buckle 4. By pressing the lever 43, the needle core buckle 2 is popped up, causing the needle core 1 to pop out of the needle sheath 3.

[0051] The needle sheath 3 is inlaid with an ultrasound-enhanced imaging ring 5, which is arranged at equal intervals to facilitate the calculation of the approximate depth of the puncture needle tip.

[0052] The ultrasound-enhanced imaging ring 5 includes a needle body imaging ring 51 and a needle tip imaging ring 52. The needle body imaging ring 51 is disposed on the main body of the needle sheath 3, and the needle tip imaging ring 52 is disposed on the tip end of the needle sheath 3. The width of the needle body imaging ring 51 is smaller than that of the needle tip imaging ring 52, so that most of the needle sheath 3 appears as a low-echo band under ultrasound, the position of the needle body imaging ring 51 on the main body of the needle sheath 3 appears as a narrow strong echo band, and the position of the needle tip imaging ring 52 at the tip end of the needle sheath 3 appears as a wide strong echo band, which makes it easy to distinguish the position and determine the position of the tip end of the needle sheath 3.

[0053] The spacing of the ultrasound-enhanced imaging rings 5 ​​is 1-1.5cm, preferably 1cm in this embodiment; the width of the needle body imaging ring 51 is 0.5-1mm, preferably 1mm in this embodiment; and the width of the needle tip imaging ring 52 is 2-2.5mm, preferably 2mm in this embodiment.

[0054] The needle core 1 is made of a metal selected from stainless steel, cobalt alloy, and titanium alloy. In this embodiment, it is preferably medical stainless steel. The needle core buckle 2, needle sheath 3, and needle sheath buckle 4 are all made of a hard plastic selected from polyethylene, polypropylene, and polycarbonate. In this embodiment, it is preferably medical polyethylene, which is not easy to break during use. The limiter 6 is made of a plastic or rubber selected from polyethylene, polypropylene, polycarbonate, butyl rubber, fluororubber, and silicone rubber. In this embodiment, it is preferably medical polyethylene.

[0055] like Figure 3 and Figure 4 As shown, the limiter 6 is circular in shape and has a seam. The two sides of the seam are closed by interlocking the inserts 61 to form a tenon structure. After the handle 62 is released, the material of the limiter 6 tends to return to its initial shape, so that the closed limiter 6 is clamped and fixed on the needle sheath 3.

[0056] The end of the insert 61 is provided with a handle 62 facing outward. When the seam is closed, the handle 62 is staggered up and down. When the handle 62 is squeezed, the limiter 6 is opened when the handle 62 is closed, the internal space of the limiter 6 is expanded, and the limiter 6 can move on the needle sheath 3 to adjust the position of the limiter 6. After releasing the hand, the limiter 6 returns to its initial shape and restores its fixing function.

[0057] like Figure 6 and Figure 7 As shown, the needle core buckle 2 is provided with a buckle hook 21 facing the head end of the needle core 1, and the hook of the buckle hook 21 faces the body of the needle core 1. The needle sheath buckle 4 is provided with a buckle protrusion 41 facing away from the end of the needle sheath 3, and the protrusion of the buckle protrusion 41 faces away from the body of the needle sheath 3. When the needle core buckle 2 is fastened to the needle sheath buckle 4, the buckle hook 21 and the buckle protrusion 41 are in contact, so as to firmly fix the needle core buckle 2 and the needle sheath buckle 4.

[0058] The needle sheath buckle 4 is provided with a fulcrum 42, and a pivot is provided on the fulcrum 42. The lever 43 rotates around the pivot. When the end of the lever 43 facing the head end of the needle sheath 3 is pressed down and the end facing away from the end of the needle sheath 3 is lifted, the buckle hook 21 is lifted up, and the needle core 1 will automatically withdraw a short distance, making it convenient to withdraw the needle core 1 from the needle sheath 3.

[0059] A puncture method suitable for real-time ultrasound guidance, using the aforementioned coaxial puncture needle for real-time ultrasound-guided puncture biopsy, comprises the following specific steps:

[0060] When using the coaxial puncture needle, first move the limiter 6 to the end of the needle sheath 3 to ensure that the needle core 1 is fixed to the needle sheath 3 by the buckle. Puncture under real-time ultrasound guidance. After the needle tip reaches the expected puncture position, adjust the position of the limiter 6 so that the limiter 6 contacts the skin, and attach the adhesive tape 7 on the limiter 6 to the skin for fixation. Press the lever 43 on the needle sheath buckle 4 with your finger to pop up the needle core buckle 2. After the needle core 1 pops out, pull the needle core 1 out of the needle sheath 3. Then the puncture needle can be used to perform biopsy sampling through the coaxial puncture needle.

[0061] Example 2:

[0062] A coaxial puncture needle suitable for real-time ultrasound guidance, such as Figure 8 and Figure 9 As shown, it is basically the same as in Embodiment 1, except that the needle sheath buckle 4 is provided with a protrusion 44 facing the head end of the needle sheath 3. After the end of the lever 43 facing the head end of the needle sheath 3 is pressed down and the buckle hook 21 is lifted, the protrusion 44 pops up when the lever 43 is no longer pressed, pushing the end of the lever 43 facing the head end of the needle sheath 3 to lift up and the end facing the tail end of the needle sheath 3 to press back, so that the lever 43 returns to its initial position.

[0063] The protrusion 44 is a round, hollow part that makes it easy for the protrusion 44 to deform when the lever 43 is pressed, allowing the lever 43 to be pressed down towards the head end of the needle sheath 3.

[0064] A puncture method suitable for real-time ultrasound guidance is used for real-time ultrasound-guided puncture biopsy with the coaxial puncture needle described above. It is basically the same as in Example 1, except that the protrusion 44 assists in pressing the lever 43 and the lever 43 returns to its original position after the needle core 1 is ejected.

[0065] The above description of the embodiments is provided to enable those skilled in the art to understand and use the utility model. It will be apparent to those skilled in the art that various modifications can be easily made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present utility model is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present utility model without departing from its scope should be within the protection scope of the present utility model.

Claims

1. A coaxial puncture needle suitable for real-time ultrasound guidance, characterized in that, The coaxial puncture needle includes a needle core (1), a needle sheath (3), and a limiter (6). The needle core (1) is inserted into the needle sheath (3), and the limiter (6) is fitted onto the needle sheath (3). The limiter (6) restricts the depth to which the needle sheath (3) penetrates the skin. An adhesive tape (7) is attached to the outer periphery of the limiter (6) to attach the limiter (6) to the skin and prevent the needle sheath (3) from being pulled away from the skin. The needle core (1) has a pointed tip and a needle core buckle (2) at the end. The needle sheath (3) has a needle sheath buckle (4) at the end. The needle core (1) is fastened to the needle sheath buckle (4) through the needle core buckle (2) and connected to the needle sheath (3). The needle sheath buckle (4) is provided with a lever (43). By pressing the lever (43), the needle core buckle (2) is lifted, so that the needle core (1) pops out of the needle sheath (3).

2. The coaxial puncture needle suitable for real-time ultrasound guidance according to claim 1, characterized in that, The needle core buckle (2) is provided with a buckle hook (21) facing the head end of the needle core (1), and the hook of the buckle hook (21) faces the body of the needle core (1). The needle sheath buckle (4) is provided with a buckle protrusion (41) facing away from the end of the needle sheath (3), and the protrusion of the buckle protrusion (41) faces away from the body of the needle sheath (3). When the needle core buckle (2) is fastened to the needle sheath buckle (4), the buckle hook (21) and the buckle protrusion (41) are in contact.

3. A coaxial puncture needle suitable for real-time ultrasound guidance according to claim 2, characterized in that, The needle sheath buckle (4) is provided with a fulcrum (42), and a pivot is provided on the fulcrum (42). The lever (43) rotates around the pivot. The end of the lever (43) facing the head end of the needle sheath (3) is pressed down, and the end facing the tail end of the needle sheath (3) is lifted up, which pushes up the buckle hook (21), and the needle core (1) is removed.

4. A coaxial puncture needle suitable for real-time ultrasound guidance according to claim 2, characterized in that, The needle sheath buckle (4) is provided with a protrusion (44) facing the head end of the needle sheath (3); The protrusion (44) is a bulging hollow part.

5. A coaxial puncture needle suitable for real-time ultrasound guidance according to claim 1, characterized in that, The needle sheath (3) is inlaid with an ultrasound-enhanced imaging ring (5), which is arranged at equal intervals.

6. A coaxial puncture needle suitable for real-time ultrasound guidance according to claim 5, characterized in that, The ultrasound-enhanced imaging ring (5) includes a needle body imaging ring (51) and a needle tip imaging ring (52). The needle body imaging ring (51) is disposed on the main body of the needle sheath (3), and the needle tip imaging ring (52) is disposed on the head end of the needle sheath (3). The width of the needle body imaging ring (51) is smaller than that of the needle tip imaging ring (52).

7. A coaxial puncture needle suitable for real-time ultrasound guidance according to claim 6, characterized in that, The spacing of the ultrasound-enhanced imaging rings (5) is 1-1.5cm, the width of the needle body imaging ring (51) is 0.5-1mm, and the width of the needle tip imaging ring (52) is 2-2.5mm.

8. A coaxial puncture needle suitable for real-time ultrasound guidance according to claim 1, characterized in that, The limiter (6) is ring-shaped and has a seam. The two sides of the seam are closed by interlocking the inserts (61) to form a mortise and tenon structure.

9. A coaxial puncture needle suitable for real-time ultrasound guidance according to claim 8, characterized in that, The end of the insert (61) is provided with a handle (62) facing outward, and the handle (62) is staggered up and down when the seam is closed.

10. A coaxial puncture needle suitable for real-time ultrasound guidance according to claim 1, characterized in that, The needle core (1) is made of metal, the needle core buckle (2), needle sheath (3) and needle sheath buckle (4) are all made of hard plastic, and the limiter (6) is made of either plastic or rubber.

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